JPH0132198Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotational drive device for a disc-shaped recording medium disk such as a magnetic disk.

[Prior art]

Conventionally, a disk rotation drive device has been developed, for example, in which the disk is rotated by a spindle hub that is attached to a position away from the rotation axis so that the position regulating pin can be tilted outward or inward. 102071, and as shown in FIG.
is inserted, and the position regulating pin 16 attached to the spindle hub (not shown) via a leaf spring member is inserted into the rectangular position regulating pin insertion hole 9b of the disk hub 9.
When the corner is pressed in the direction of rotation after being inserted accurately into the
It is configured so that the position is restricted by hitting the two sides of a, the a side and the b side, at two points, but the position restricting pin 16
When the disc hub 9 is placed on the spindle hub and is magnetically attracted, the relative relationship between the position regulating pin 16 and the position regulating pin insertion hole 9b is When the positional relationship is in the arrangement state shown by the imaginary line in FIG. Pressed downward. At this time, it rotates in this state and a part of the cylindrical part of the position regulating pin 16 is inserted into the insertion hole 9.
The disk hub 9 may be fixed in position and rotated in a tilted state when it comes into contact with the short side of b and does not fully enter, and the disk hub 9 is not urged in the direction of arrow I by the position regulating pin. Since the rotating shaft 10 is not pressed against the two sides of the central square hole 9a, its position is not restricted and the disk hub is lifted from the spindle hub.

Furthermore, the position regulating pin 16 falls in the tangential direction with respect to the rotational direction, causing relative misalignment between the disk and the magnetic head, and the index period shifts, but it is difficult to prevent the position regulating pin 16 from falling in the tangential direction. Furthermore, if the position regulating pin 16 is attached to the top surface of the leaf spring member, the spring force of the leaf spring has greater variation than that of a coil spring, so the positioning force of the position regulation pin pushing the disk will vary widely, causing the disc to The disadvantage is that the position cannot be determined accurately.

[Purpose of invention]

In view of the above drawbacks, the present invention stabilizes the rotational drive by reducing variations in the positioning force and positioning torque that the positioning pin pushes against the disk, and reduces the tangential tilt of the positioning pin to improve the relationship between the disk and the head. An object of the present invention is to propose a disk rotation drive device that prevents relative displacement of the disk.

[Structure of the idea]

The present invention provides a disk rotation drive device in which a disk is rotationally driven by a spindle hub which has a rotation axis and a position regulation pin is attached to a position apart from the rotation axis so as to be deflectable. The pin is biased to protrude perpendicularly to the disk surface to be rotated by a first spring and housed in a holder, and the holder is biased radially outward by a second spring to cause the disk to be attached to the spindle hub. The reason is that it is held movable only in the radial direction.

〔Example〕

The present invention will be explained with reference to an embodiment of the drawings. The disk rotation drive device is shown in FIGS. 1 to 3, in which a center portion 1a of a spindle hub 1 is fixed to a rotating shaft 10 of a motor (not shown), and an annular groove 1 is formed around the center portion 1a.
A yoke 3 is formed with an annular outer wall 1c and an annular groove 1b, and a magnet 2 is fixed in the annular groove 1b. 2
A U-shaped metal holder frame 4 is fitted into the notch 3a of the yoke 3 and fixed by adhesive, and the metal holder 6 is connected to the holder frame 4 and a metal stopper plate 5 adhesively fixed to one side of the holder frame. It is held slidably outward in the radial direction, a metal position regulating pin 7 is fitted into the vertical through-hole 6a of the holder 6 so as to be movable up and down, and a metal lower cover 8 is fixed to the lower surface of the holder 6. A pin 11 is fixed to the lower cover 8.

Recesses 1e, 1e are formed in the annular grooves 1b at both edges of the large notch 1d of the spindle hub 1, respectively, and protrusions 4a protrude from both sides of the holder frame 4.
4a is fitted, and the protrusion 4a is prevented from coming off on the bottom surface of the yoke 3 as shown in FIG.

The holder frame 4 and the stop plate 5 are fitted with the concave portion 4b and the convex portion 5a and fixed with adhesive, and the holder frame 4 and the stop plate 5 are provided with through holes 4c and 5b.
Pins 12 and 13, which are fixed integrally or separately, are fitted, and the holder 6 is biased radially outward by a second spring 14 fitted on the outside of the pin 12. A bulging portion 6b having approximately the same size as the width of the holder frame 4 is integrally formed on the lower side of the holder 6, and a space portion 6c and a notch portion 6d having an inner diameter larger than the through hole 6a are formed below the center of the holder 6. is formed.

The position regulating pin 7 is provided with a collar 7a on the lower outer periphery to prevent it from coming off upward within the holder 6, and a hole 7b is bored in the lower center, into which the first spring 15 and pin 11 are inserted. A protrusion 8a that is biased to protrude in the vertical direction and protrudes from the outer periphery of the lower lid 8 is fitted into the notch 6d of the holder 6 and fixed with adhesive.

When the disk rotation drive device is constructed as described above and the disk hub 9 shown in FIG. 5, which is made of a disk magnetic material and is housed in a case (not shown), is placed on the spindle hub 1, the rotation axis 10 is centered. When the position regulating pin 7 is inserted into the square hole 9a and inserted into the position regulating pin insertion hole 9b, the rotation of the spindle hub 1 causes the position regulating pin 7 to hit the corner of the insertion hole 9b and move the disk hub 9 in the radial direction. The second spring 14 presses and biases the rotating shaft 1 in the outward direction of the arrow I.
The two sides a and b of the central square hole 9a abut against the center square hole 9a at two points, and the disk hub 9 is positionally regulated and attracted by the magnet 2, and is accurately regulated and rotationally driven.

When the disk hub 9 is placed on the spindle hub 1 and the position regulating pin 7 is arranged as shown by the imaginary line in FIG. 6, the position regulating pin insertion hole 9
The insertion hole 9 is pressed downward by the long edge of b.
When the disk hub 9 is on the underside of a position other than position b, it is pressed in the same way, but the position regulating pin 7 is vertically lowered within the holder 6 without falling, and the spindle hub 1 is rotated relative to the disk. When the position regulation pin 7 is inserted into the position regulation pin insertion hole 9b in the state shown in FIG. Similarly to the above, the disk hub 9 is biased radially outward in the direction of arrow I, and the rotating shaft 10
The two sides a and b of the central square hole 9a abut against each other at two points, and the disk hub 9 is accurately regulated in position and is attracted by the magnet 2 and driven to rotate.

Therefore, the position regulating pin 7 is set at x in the disk radial direction.
The holder frame 4, the stop plate 5, and the holder 6 are independently biased by the second spring 14 and the first spring 15 in the z-direction perpendicular to the disk surface.
Since the disc is held in the x direction, z direction, and the y direction of the disc rotation direction, the problem of the disc lifting up due to the tilting of the position regulating pin is eliminated, and the spring force in each direction is independent. Since the spring force of the second spring 14 can be set with less variation, it is possible to reduce variations in the positioning force with which the position regulating pin presses the disk, and the position of the disk can be determined accurately. This eliminates the relative misalignment between the disk and the magnetic head and the misalignment of the index period.

[Effect of idea]

As described above, the present invention uses a first spring to urge the position regulating pin to protrude perpendicularly to the disk surface within the holder, and a second spring to urge the holder outward in the radial direction. It has a simple structure that allows it to be mounted on the hub in a tiltable manner, and the disk position is regulated and will not fall even if the position control pin is pressed, so the disk will not lift up, and the design allows the spring force in each direction to be determined independently. In addition, since the spring force of the second spring can be set with less variation, it is possible to reduce the variation in the positioning force of the position regulating pin that pushes the disk, and the position of the disk can be accurately determined and the magnetic force between the disk and magnetic field can be reduced. It is possible to provide a disk rotation drive device that has excellent practical effects in which the relative deviation with the head and the deviation in the index period are eliminated.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an embodiment of the present invention, Fig. 2 is a plan view, Fig. 3 is a side view, Fig. 4 is a cross-sectional side view taken along line - Fig. 2, and Fig. 5 is a disk hub. FIG. 6 is an explanatory diagram of the rotating shaft and the position regulating pin, and FIG. 6 is an explanatory diagram of the state of engagement between the conventional position regulating pin and the position regulating pin insertion hole. 1...Spindle hub, 6...Holder, 7...
...Position regulation pin, 10...Rotation shaft, 14...Second
Spring, 15...first spring.

Claims (1)

[Scope of utility model registration request] In a disk rotation drive device, the disk is rotatably driven by a spindle hub which has a rotation axis and a position regulation pin is attached to a position apart from the rotation axis so as to be able to be deflected, wherein the position regulation pin is rotationally driven. A first spring forces the disk to protrude in a direction perpendicular to the surface of the disk and stores it in a holder, and a second spring urges the holder radially outward to move the disk only in the radial direction. A disk rotation drive device characterized in that the disk can be held.